let standing_book_group_modify_req_item = {
        "uid":"",                               // uid
        "return_record":"",                    // 回访记录
        "suspect_flag":1,                              // 是否定位嫌疑人，默认为0，1-是 0-否
        "delete_uid_flag":0
}
let a = {
    "uid":"3630408"                    // uid
}

let b = Object.assign(standing_book_group_modify_req_item,a);
console.log(b)
console.log(a)
